Jack for agricultural machines



March 16, 1954 F LEE 2,672,318-

JACK FOR AGRICULTURAL MACHINES Filed Nov. 8, 1950 Patented Mar. 16, 1954 JACK FOR AGRICULTURAL MACHINES Francis Lee, Stretford,

Massey-Harris Limited,

body corporate of Great Britain England, asslgnor to StretiEord, England, a

Application November 8, 1950, Serial No. 194,617

2 Claims.

This invention relates to improvements in jacks for agricultural vehicles and more particularly to trailers therefor.

According to the invention a channel shaped jack arm is pivoted to the tow bar and connected thereto intermediate its ends by a rod having a cranked end, a skid being mounted on the eX- treme end of the arm.

The invention will be described with reference to the accompanying drawings:

Fig. l is a side elevation of the jack arm in the raised position.

Fig. 2 is a similar lowered.

Fig. 3 is a perspective view of the draw bar and jack arm. 7

A tractor trailer A is drawn by a tow or draw bar 2 to which i pivoted a channel shaped arm which is also connected thereto intermediate its ends by a screwed rod 3, having a cranked end. A U-shaped skid 4 is mounted on the extreme end of th arm I.

The channel jack arm I is pivoted on a bolt I passing through the draw bar 2 of the trailer A. The free end of the arm I is connected to the draw bar 2 by th threaded spindle 3 universally attached at its lower end to a bracket 5 capable of sliding between the two sides of the arm. The bracket 5 is formed with two guide bracket engaging the sides of the channel arm I and with a nut 5 formed with pivots 5 engaging holes in the guide brackets to enable the nut to pivot in the bracket. The spindle 3 is screwed through a nut 6 mounted in a bracket 6 pivoted on the draw bar or pins 6 The cranked operating handle on its free end enables the rod 3 to be rotated to vary the inclination of the trailer A when jacked up in accordance with the height of the hitch on the tractor. The catch I is urged by spring 8 into engagement with th jack arm I. When catch I is manually released, the jack arm drops downwardly, the bracket 6 sliding on the jack arm until it engages the skid 4 which serves as a stop.

In operation, before disconnecting the draw bar 2 from its tractor, the free end of the arm I is screwed down to a ground-engaging position to bring the skid 4 into contact with the ground, the bracket 5 having already travelled down the arm I. After the tractor has been uncoupled, th forward end of the trailer A rests on the jack arm I with the draw bar 2 in the towing position ready for recoupling to the tractor A. After recoupling the trailer to the tractor the jack arm I may be raised slightly by rotating the screwed rod before view showing the jack arm 2 the jack arm is manually pivoted to a position parallel to the draw bar 2 with the front of the skid 4 engaging the pivoted catch 7 on the draw bar (Fig. 2). The bracket 5 on the lower end of the screwed rod 3 slides up the arm during the raising operation.

The arm I is prevented from inadvertently being lowered during towing by the catch 7, the catch being prevented from moving too far when the arm I is released by a tail lever I thereon engaging the lower coupling member 2 of the draw bar 2.

I claim:

1. A vehicle jack arrangement for a trailer comprising in combination, a forwardly extending tow bar member attached at one end thereof to the trailer; a jack arm pivoted at one end thereof to said tow bar member movably from an inoperative position substantially parallel to the same to a ground-engaging position angularly spaced from said tow bar member; nut means pivotally mounted on said tow bar member spaced from said one end thereof; a bracket slidably mounted on said jack arm; stop means secured to the other end of said jack arm and limiting movementof said slidable bracket; a swivel pivotally mounted on said bracket; a threaded spindle screwed through said nut and fixedly secured at one end there of to said swivel, said spindle pivcting with said nut means from a raised inoperative position to a supporting position extending transversely to said tow bar member when said bracket slides along said jack arm while said jack arm pivots to said ground-engaging position; operating means on the other end of said threaded spindle for rotating the same for adjusting said ground-engaging position of said jack arm; releasable holding means for holding said jack arm in said inoperative position.

2. A vehicle jack arrangement for a trailer comprising in combination, a forwardly extending tow bar member attached at one end thereof to the trailer and including two parallel bars; a jack arm pivoted at one end thereof to said tow bar member movably from an inoperative position substantially parallel to the same and extending between said two bars to a groundengaging position angularly spaced from said tow bar member; nut mean pivotally mounted on said tow bar member spaced from said one end thereof and located between said two bars; a bracket slidably mounted on said jack arm movably from a position located adjacent to the pivoted end Of said jack arm to a position located adjacent to the free end of said jack arm; a

swivel pivotally mounted on said bracket; a threaded spindle screwed through said nut and fixedly secured at one end thereof to said swivel, said spindle pivoting with said nut means from a raised inoperative position to a supporting position extending transversely to said tow bar member when said bracket slides along said jack arm while said jack arm pivots to said groundengaging position; a ground-engaging skid member secured to the free end of said jack arm and 1 limiting movement of said slidable bracket; spring-loaded catch means pivotally mounted on said tow bar and releasably holding the free end of said jack arm in said inoperative position thereof; and handle means on the other end of said threaded spindle for rotating the same for adjusting said ground-engaging position of said jack arm.

FRANCIS LEE.

Number Number Name Date Bolgard Dec. 2, 1930 Hamilton Oct. 17, 1933 Johnston Aug. 17, 1943 Seaholm Mar. '7, 1950 FOREIGN PATENTS Country Date Switzerland Sept. 16, 1932 

